Spectacle lens of glass-resin lamination and production of the same

Abstract

A spectacle lens, on the inner surface of which glass layer a synthetic resin layer is laminated, is provided, in more details, a high-performance spectacle lens of glass-resin lamination is provided together with its production method, the object side of which lens is made from an optical glass hard and less vulnerable to shape transformation while the ocular side of which lens is made from a transparent synthetic resin, which is easy to be ground and polished, so as to be provided with a refractive power as required for correcting a refraction or adjustment error of a particular individual's vision problem in an economical and a labor-saving manner. Concretely speaking, a glass layer and a synthetic resin layer are integrally joined through the interposition of a thin buffering resin layer so as to prepare a see-through lens block, the object side of which block corresponds to the glass layer while the ocular side of which block corresponding to the synthetic resin layer, on which layer a curvature grinding and polishing operation is performed so as to be provided with a refractive power required for correcting a refractive error of a particular individual's vision.

1 . A spectacle lens of glass-resin lamination comprising at least a glass layer  1  at an object side thereof and a synthetic resin layer  2  at an ocular side thereof wherein said glass layer  1  and said synthetic resin layer  2  are integrally joined through an interposition of a thin buffering resin layer  3  made from a transparent synthetic resin and a curvature grinding and polishing operation is performed on said synthetic resin layer  2  at the ocular side of said spectacle lens so as to be provided with a refractive power required for correcting a refractive vision error of a particular individual.  
     
     
         2 . A spectacle lens of glass-resin lamination according to  claim 1  wherein said glass layer  1  is made from an optical glass plate  1 ′ having a convex curvature on an outer surface thereof and said synthetic resin layer  2  is integrally jointed with said glass layer  1  through an interposition of a transparent synthetic resin film  3 ′ to form the buffering resin layer  3 , which film is attached on an inner surface of said optical glass plate  1 ′, by die-casting said resin layer  2  on said resin film  3 ′.  
     
     
         3 . A spectacle lens of glass-resin lamination according to  claim 1  wherein the glass layer  1  is made from an optical glass plate, in a part of which plate a bi-focal portion  11  possessed with a convex lens function is embedded.  
     
     
         4 . A spectacle lens of glass-resin lamination in any one of the preceding claims wherein the glass layer  1  is made from an optical glass plate having a curvature on an outer surface thereof while the synthetic resin layer  2  is made from a transparent synthetic resin plate shaped such that it fits into an inner surface of said glass layer  1 , and said transparent synthetic resin plate and said glass plate are integrally joined through an interposition of a transparent synthetic resin film so as to form a stratum comprising the glass layer  1 , the buffering resin layer  3  and the synthetic resin layer  2 .  
     
     
         5 . Method for producing a spectacle lens of glass-resin lamination comprising the steps of applying a transparent adhesive onto an inner surface of an optical lens  1 ′ having a curvature on an outer surface thereof and adhering a transparent synthetic resin plate  2 ′, which plate is shaped such that it fits into said inner surface, onto said inner surface so as to obtain a see-through lens block B arranged such that a glass layer  1  and a synthetic resin layer  2  are integrally joined through an interposition of a buffering resin layer  3 ; and performing a curvature grinding and polishing operation on said synthetic resin layer  2  so as to be provided with a refractive power required for correcting a refractive error of a particular individual's vision.  
     
     
         6 . Method for producing a spectacle lens of glass-resin lamination comprising the steps of attaching a transparent synthetic resin film  3 ′ onto an inner surface of an optical lens  1 ′ having a curvature on an outer surface thereof and applying a transparent adhesive onto said synthetic resin film  3 ′ so as to adhere a transparent synthetic resin plate  2 ′, which plate is shaped such that it fits into said inner surface, onto said resin film  3 ′ so as to obtain a see-through lens block B arranged such that a glass layer  1  and a synthetic resin layer  2  are integrally joined through an interposition of a buffering resin layer  3 ; and performing a curvature grinding and polishing operation on said synthetic resin layer  2  so as to be provided with a refractive power required for correcting a refractive error of a particular individual's vision.  
     
     
         7 . Method for producing a spectacle lens of glass-resin lamination comprising the steps of disposing an optical lens  1 ′ having a curvature on an outer surface thereof, on an inner surface of which lens a transparent synthetic resin film  3 ′ is attached, into a casting die D; injecting a casting resin onto said synthetic film  3 ′ and solidifying said resin so as to obtain a see-through lens block B arranged such that a glass layer  1  and a synthetic resin layer  2  are integrally joined through an interposition of a buffering resin layer  3 ; and performing a curvature grinding and polishing operation on said synthetic resin layer  2  so as to be provided with a refractive power required for correcting a refractive error of a particular individual's vision.